Feeding Neural Networks in the Mollusc Aplysia
| Autor: | Colin G. Evans, Elizabeth C. Cropper, Jian Jing, Itay Hurwitz, Adarli Romero, Alex Proekt, S. C. Rosen |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Neurosignals. 13:70-86 |
| ISSN: | 1424-8638 1424-862X |
| DOI: | 10.1159/000076159 |
| Popis: | Aplysia feeding is striking in that it is executed with a great deal of plasticity. At least in part, this flexibility is a result of the organization of the feeding neural network. To illustrate this, we primarily discuss motor programs triggered via stimulation of the command-like cerebral- buccal interneuron 2 (CBI-2). CBI-2 is interesting in that it can generate motor programs that serve opposing func- tions, i.e., programs can be ingestive or egestive. When programs are egestive, radula-closing motor neurons are activated during the protraction phase of the motor program. When programs are ingestive, radula-closing motor neurons are activated during retraction. When motor programs change in nature, activity in the radula- closing circuitry is altered. Thus, CBI-2 stimulation ste- reotypically activates the protraction and retraction cir- cuitry, with protraction being generated first, and retrac- tion immediately thereafter. In contrast, radula-closing motor neurons can be activated during either protraction or retraction. Which will occur is determined by whether other cerebral and buccal neurons are recruited, e.g. rad- ula-closing motor neurons tend to be activated during retraction if a second CBI, CBI-3, is recruited. Fundamen- tally different motor programs are, therefore, generated because CBI-2 activates some interneurons in a stereo- typic manner and other interneurons in a variable man- ner. |
| Databáze: | OpenAIRE |
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